Rapidity distributions in exclusive Z+jet and γ+jet events in pp collisions at s √ =7 TeV
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AuthorChatrchyan, Serguei; Brochero Cifuentes, Javier Andrés; Cabrillo Bartolomé, José Iban; Calderón Tazón, Alicia; Chuang, Shan Huei; Duarte Campderrós, Jordi; Fernández García, Marcos; Gómez Gramuglio, Gervasio; González Sánchez, Francisco Javier; Graziano, Alberto; Jordá Lope, Clara; López Virto, María Amparo; Marco de Lucas, Jesús; Marco de Lucas, Rafael José; Martínez Rivero, Celso; Matorras Weinig, Francisco; Muñoz Sánchez, Francisca Javiela; Rodrigo Anoro, Teresa; Rodríguez Marrero, Ana Yaiza; [et al.]
Rapidity distributions are presented for events containing either a Z boson or a photon with a single jet in proton-proton collisions produced at the CERN LHC. The data, collected with the CMS detector at s √ =7 TeV , correspond to an integrated luminosity of 5.0 fb −1 . The individual rapidity distributions of the boson and the jet are consistent within 5% with expectations from perturbative QCD. However, QCD predictions for the sum and the difference in rapidities of the two final-state objects show discrepancies with CMS data. In particular, next-to-leading-order QCD calculations, and two common Monte Carlo event generators using different methods to match matrix-element partons with parton showers, appear inconsistent with the data as well as with each other.